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(31) The variation of stream discharge would increase at a watershed where the proportion of betel palm plantation is large. However, forested land has the agent of regulating stream discharge.

(32) Few students in experimental group reported that they have use tobacco, alcohol and betel quid at pre-test, however, they stop using or decreasing use amount at post test.

(33) The extraction of arecoline from betel nut husk was performed using ethanol refluxing.

(34) The suitable temperature and humidity for fresh preservation of betel nut in store hasbeen reported here.

(35) Using an extendable carbon-fibre pruning hook is a much easier way of harvesting betel nuts than climbing the tree!

(36) Asian pepper plant whose dried leaves are chewed with betel nutbetel palm by southeast Asians.

(37) The Areca nut , by association, is sometimes inaccurately called the "Betel nut".

(38) The Vietnamese custom of eating betel nut has a long history and is still alive.